<?php echo $ajax->link('Import', 
        array(
            'controller' => isset($controller)? $controller: null,
            'action' => isset($action)? $action: 'import', isset($params)? $params: null),
        array( 'class' => 'button import', 'update' => $update, 'position' => 'bottom', 'indicator' => 'indicator' ));?>